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Yeah but that's excatly my question how good is the battery life of the Lumia 640 XL in comparision to the Lumia 1520 in Windows 10? I know back then the 1520 haf excellent battery life, but how is it in win 10 and compared to the Lumia 640 XL.

At one time, the 1520 and 920 had excellent battery life. I noticed that Windows 10 really sucks it down more than 8.x ever did. Granted, it is a much more capable OS, but after having the 1520 on Windows 10 for some time, battery life was no longer a huge plus for the platform any longer. You're just going to have to do what every other smartphone user does - carry a portable charger, or in the case of the 950 XL, a spare battery, if you so choose. My 6P only lasts me about 9-10 hours anymore.